Sol-gel-derived thick coatings and their thermomechanical and optical properties

Martin Mennig; Gerhard Jonschker; Helmut K. Schmidt

doi:10.1117/12.132007

7 December 1992 Sol-gel-derived thick coatings and their thermomechanical and optical properties

Martin Mennig, Gerhard Jonschker, Helmut K. Schmidt

Proceedings Volume 1758, Sol-Gel Optics II; (1992) https://doi.org/10.1117/12.132007
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

The preparation of crackfree and transparent SiO₂ coatings on soda lime glass with thicknesses of about 8 micrometers after densification at 500 degree(s)C is presented. The high thickness can be obtained by using an 80:20 mixture of methyltriethoxysilane and tetraethyl orthosilicate as alkoxide precursors in combination with an aqueous colloidal SiO₂ sol with particle sizes of about 7 nm. This principle of synthesis is also applied to ZrO₂ containing coatings yielding to thicknesses of about 3 micrometers . Refractive index measurements indicate that the coatings are nearly completely densified. At higher temperatures tensile stresses appear within the layers and are transmitted to the substrate, increasing its thermal stability.

Citation Download Citation

Martin Mennig, Gerhard Jonschker, and Helmut K. Schmidt "Sol-gel-derived thick coatings and their thermomechanical and optical properties", Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992); https://doi.org/10.1117/12.132007

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